If 20% of (A+B) = 50% of (A-B), then A:B is: MCQ with Answer and Explanation

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If 20% of (A+B) = 50% of (A-B), then A:B is:

A. 3:5

B. 7:3

C. 3:7

D. 5:3

Answer: Option B

Solution (By JKSSB Mock Tests)

0.2(A+B)=0.5(A-B) → 2(A+B)=5(A-B) → 2A+2B=5A-5B → 7B=3A → A/B=7/3.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

10% of 300 + 20% of 150 equals:

A. 55

B. 50

C. 65

D. 60

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Correct Answer: Option D

Explanation:
10% of 300 = 30, 20% of 150 = 30, sum = 60.

This question belongs to: Maths Percentage

Question #2

In a college, 40% are girls. 50% of the boys and 60% of the girls passed an exam. If 460 students failed, find the total number of students.

A. 800

B. 1100

C. 900

D. 1000

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Correct Answer: Option D

Explanation:
Total T. Boys=0.6T, girls=0.4T. Passed=0.5×0.6T+0.6×0.4T=0.3T+0.24T=0.54T. Failed=0.46T=460 → T=1000.

This question belongs to: Maths Percentage

Question #3

A train 150 m long crosses a pole in 10 seconds. What is its speed in kmph?

A. 36 kmph

B. 54 kmph

C. 45 kmph

D. 60 kmph

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Correct Answer: Option B

Explanation:
Speed = 150/10 = 15 m/s = 15 × 18/5 = 54 kmph.

This question belongs to: Maths Percentage

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